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Kenji Nishina, Yoshiaki Matsuda, Hiroharu Matsueda, Katsuji Takeuchi, Takuya Ohgane, Yoshio Sugawara, Masazo Takami, Toru Kitajima. "Geology of subaqueous volcanic rocks and stone material of historic buildings, in Otaru, Hokkaido." Chishitsugaku zasshi 125.5 (2019) 387-402